| Author | Message | ||
     Zenbiker |
I am having problems with my rear brakes sticking. The metal 'plunger' appears to be a little further out of the rubber grommet than it should be (compared to other S2s) and does not retract by itself. This makes the rear brake drag. Does anyone have any ideas on what the cause is/solution is ? The other question I have is that I have seen a welded 'box' on the left side of the swing arm by the brake on some bikes and not on others, why is this? What does it do? Thanks! | ||
| Ratbuell |
The solution for #1 would be a caliper rebuild kit. Pistons and seals. For #2...could be the difference between Brembo and PM calipers (there was a mid-model change in suppliers). Maybe. I know on my S1W, there's a boxed-in channel where I can slide the caliper fore and aft to make wheel removal easier; don't remember if that's on the S2 or not, haven't had to take that one apart for a while  | ||
| Bluzm2 |
Neil, I'll go check both of our S2's and a spare swing arm I have laying around.. Brad | ||
| Bluzm2 |
Ok, I checked. Both the 95 and the 96 have boxed in brake arm stay socket. So does the spare on the bench. According to my serial number, my 95 was late in the year. | ||
| Zenbiker |
Hey Thanks for the feedback Joe & Brad, I appreciate it. The odd thing is that one was built around 600ish in 95, the other 1300ish in 96 (I think). They both have Brembo rears, and I included a picture of the brake 'plunger', it kind of necks in before it goes into the rubber piece) It does not want to 'return' on its own and actually fell out of the rubber boot on my way home. So I put it back in and that was it for riding it until I can get it rebuilt. The real interesting thing then is comparing the two swingarm photos and the early bike is missing the welded 'box'. Well, thanks for your efforts, I will have to dig through some of my books and stuff to see if I can find an explanation for this mystery.    | ||
| Leftcoastal |
You'll find the 'welded box' built into the back of the swingarm on the bike with the wave rotor. It's not actually missing, it's just been incorporated into the back of the rectangular tubing of the unit, rather than welded on to the top. The caliper bracket has a pin or part of the casting that extends into the 'box' and stabilizes the brake by keeping the whole mess from spinning around on the axle and ruining your riding day. It's slotted so that the caliper mount can move with the axle for adjusting the belt (or chain if it's been converted to one). The master cylinder of my RS was sticking and wouldn't return to the extended position, similar to what you described. I replaced it with one I found on ebay for pretty cheap. The S2 parts are a bit different but are likely available. Don't expect that rear brake to function as a facility to slow the motorcycle. It seems to be designed to serve for holding the bike from rolling when stopped on a hill. Unless, of course, the hill is sloped, or something. (Message edited by leftcoastal on May 04, 2010) | ||
| Bluzm2 |
Neil, I never even noticed that when you stopped by! Your box is outside of the swingarm, never seen that before. I thought you meant the "internal box" vs a slot. I think yours is a very oddball unit. I think we have to consider the source of the bike. He had access to unobtainium the rest of us don't. Brad BTW, we need to make a stop at your house and take a picture. Carl and Rod and me. We'll have 5 S2's in one spot! | ||
| Kmbuell |
Just thinking, but I'm pretty sure the "box on top" style is the original part, the "internal box" is the recall part. Not positive, but on my original bike, the box is on top and the angles are mitered, the bikes with recall swingarms the box is internal and the angles are bent. They look hydroformed. Don't know for sure. If you want to trade a recall swingarm for the box on top let me know. I'm looking for one for my restoration of S2 #1000. Check with St Paul HD, for either the rebuild kit or a new rear master. Lance has both, really cheap. On eBay now. Kevin | ||
| Spiderman |
Box on top is the recall unit. I have 2 in my garage... | ||
| Kmbuell |
Spidy, You may have two in your garage, but I've got an original July '94 built S2 that I've owned since August '94 that has had ZERO recalls done to it. Trust me, the block on top is the original if it's also mitered and welded. If that's what you have, let me know if you want to part with one. There may be some recall units that have the box on top that I've never seen. I've got five of the recall units, all are bent and braced and all have the internal slot. Maybe 1313 or Court can answer this. And please spare me the "you gotta do the safety recalls". I've had many conversations with Marty Brown the original Buell engineer who discovered the issue with repeated stoppies testing Nissin brakes. Marty called me about a week after I took delivery and we had a lot of great conversations and rides. I wish I knew where he is today. I lost track of him shortly after he left Buell to go with Nissin. Kevin | ||
| Zenbiker |
Thanks for the feedback guys. I have been comparing the two S2s and am more confused than before. I looked in the service manual and it had a picture of the 'external' boxed rear swing arm, so I am assuming that that was the original plan for this piece. I feel lame, but I think that I am going to take the easy way out and just buy a new rear master unit, as I don't know how to install the rebuild kit. Brad, I got some beer, what are you doing in the coming weeks  | ||
| Ratbuell |
Mail me your part and your rebuild kit, I'll slap 'er together for ya and send it back  Service manual should have an explanation for the rebuild in it. It's only a couple of pieces, just take your time and line parts up (I use either an old white bedsheet or some paper towels) as you remove them, so you remember which order to put 'em back in. | ||
| Zenbiker |
Hey Joe, Thanks, I really appreciate your offer. But because I live in the Mpls/St. Paul area, so I went to St. Paul HD and bought a new master cylinder for $20ish bucks. I probably should have told everyone that I had bought a new (to me) S2. This one has some cool and trick things on it (it was raced at Elkhart lake on the weekends and had the dual disk set up on the front, a HD dealer however, removed it and sold it years back). So I am trying to keep 'Ole Red (whom I saved from an HD dealer that said he was "going to chop'er or turn 'er into a drag bike") and the new one, looking nice an running well. I really appreciate the help I get from fellow BW members. Thanks again, Zenbiker | ||
| Easy_rider |
Zen, Rat beat me to the punch - I'm willing to rebuild it for you as well but you'd have no trouble doing it yourself. A buddy on hand to chase any parts that shoot out is a plus, though. | ||
| Zenbiker |
Thanks Easy. That is what I really like about the BW, not only is there some real cool things going on here, but there is a disproportionate amount of solid individuals on this board. I have a sick GF that I am tending too, but will pick up the dot 5 and get this beast on the road by the weekend. Take care, Zenrider |
